SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 42: Interface Controlled Properties and Nanomaterials: Nanoporous Materials and Nanolaminates

MM 42.2: Vortrag

Donnerstag, 30. März 2023, 16:00–16:15, SCH A 215

Microstructure and mechanical behavior of hierarchical nanoporous gold-polypyrrole electrochemical actuators — •Olga Matts and Nadiia Mameka — Helmholtz-Zentrum Hereon, Geesthacht, Germany

Dealloyed nanoporous (np) metals have emerged as promising (electro-)chemical actuators that can compete with conventional actuator materials in terms of large actuation stroke, high strain energy density and low operating voltage [1]. Combining np metals with a conducting polymer polypyrrole (PPy) has been found as an effective way to enhance the actuation strain, mechanical strength and stiffness of np metals [2, 3]. Due to the synergistic effect of the two individual components at the nanoscale, such hybrid structures demonstrate enlarged actuation and tunable elastic modulus amplitudes as well as afford fast response times as compared to PPy alone [1].

In this work, we investigate an effect of structural hierarchy on actuation and elastic properties of hierarchical (hc) np-Au/PPy hybrids. We study the behavior in aqueous electrolyte under potential control, exploiting the ability of PPy to change its volume under reversible redox reactions. We reveal pronounced variations in the macroscopic length and Young*s modulus in response to the voltage-induced volume changes of PPy. We correlate this behavior with PPy fractions in pores and discuss the underlying mechanisms of the observations.

[1] Wittstock et al. (ed.), RCS (2012). [2] Roschning et al., Adv. Mater. Interfaces (2020). [3] Li et al., Acta Mater., 212 (2021).